CN101846531B - Multipole combined-type magnetic encoder - Google PatentsMultipole combined-type magnetic encoder Download PDF
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- CN101846531B CN101846531B CN2010101858007A CN201010185800A CN101846531B CN 101846531 B CN101846531 B CN 101846531B CN 2010101858007 A CN2010101858007 A CN 2010101858007A CN 201010185800 A CN201010185800 A CN 201010185800A CN 101846531 B CN101846531 B CN 101846531B
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The invention discloses a multipole combined-type magnetic encoder which comprises a multipole combined-type magnetic grid and a signal processor, wherein the multipole combined-type magnetic grid is arranged in a shell and used for synchronously rotating along with a motor shaft, and three different magnetic fields are respectively generated on the multipole combined-type magnetic grid; and the signal processor is arranged in the shell and used for detecting a magnetic signal generated on the multipole combined-type magnetic grid, then converting the magnetic signal into high-resolution incremental-type A, B, Z electric signals and low-resolution absolute-type U, V, W electric signals and outputting . The multipole combined-type magnetic encoder has the advantages of high speed, small size and high resolution.
The present invention relates to the encoder techniques field, be specifically related to a kind of multipole combined-type magnetic encoder.
Along with the development of kinetic control system, direct current generator to the transformation of digital control, all be unable to do without scrambler to the transformation of alternating current generator and analog control, and the encoder techniques level directly has influence on the performance of kinetic control system.As a kind of spin angular position, angular velocity are converted to the angular displacement sensor of electric signal, it is of a great variety, divides by the output electrical signal form, can be divided into analog and digital two big classes.Analog sensor comprises selsyn, tech-generator etc., and digital transducer comprises optical encoder, magnetic encoder etc.
At present, widespread use is digital sensor-photoelectric encoder in commercial production, and technology is very ripe, and precision and resolution are than higher.But the grating dish of photoelectric encoder is when pivoting, and shaft vibration easily makes the fragmentation of grating dish; The shock resistance of grating dish, anti-vibration performance are not high; The serviceable life of optical device is limited; Especially for rugged surroundings bad adaptability such as water, dust; Structure is complicated with the location assembling, and cost is higher; The grating line width has the limit, realizes that high resolving power just needs the very big grating dish of diameter, is difficult to realize miniaturization.Yet magnetic coder, according to the magnetoelectricity principle, it is simple in structure, can run up, response speed is fast, be easy to miniaturization, not high to environment requirement; When producing in enormous quantities, magnetic encoder reduces cost than optical encoder is easier.So in the kinetic control system in future, the consumption of magnetic encoder will increase gradually.
Magnetic coder must increase the multipole combined magnetic grid of number of magnetic poles or the littler pole span of employing as obtaining high resolving power.But, improve number of magnetic poles and adopt the multipole combined magnetic grid of littler pole span to have certain degree of difficulty owing to reasons such as the technology that magnetizes, usage space, leakage field distributions.Increase the size that number of poles will increase the scrambler magnet steel, be unfavorable for miniaturization.Adopt the multipole combined magnetic grid of littler pole span, if multipole combined magnetic grid do during the same size with grating, magnetic field intensity is very weak, magnetic sensor is difficult in and detects faint like this signal under the contactless state, the homogeneity that magnetizes simultaneously is difficult to guarantee.So adopt electronic fine-grained mode to improve resolution usually.Could effectively solve the contradictory problems between volume and the resolution like this.
Magnetic coder comprises employing monopolar type and multipolar system magnet steel two big classes.For the monopolar type magnetic coder, magnet steel rotates a circle, and Magnetic Sensor is only exported the sinusoidal simulating signal of class of pair of orthogonal.Obtain high-resolution position signalling, must carry out the electronic fine-grained of high multiple this signal.Yet need use analog to digital conversion when carrying out the analog quantity segmentation, analog-to-digital speed has also just determined subdividable multiple.So the degree of accuracy that analog to digital conversion time and position signalling are differentiated is a pair of contradiction, the problem of segmentation too high easy appearance response of multiple and accuracy aspect.Simultaneously, owing to there are the factors such as limitation of external interference and Magnetic Sensor itself, consistance, the integrity degree of Magnetic Sensor output waveform are limited, and the segmentation multiple is excessive, more obvious the error exposure easily, thus cause new error.So must could obtain high speed, high-precision, undersized magnetic coder in conjunction with electronic fine-grained and multipolar system magnet steel.
Scrambler needs to obtain current absolute location information in AC servo is used, and motor could be exported corresponding electromagnetic torque, makes rotor rotation.Yet A, B, Z increment type servo-drive system are when just powering on, and system can not obtain current absolute position, can only obtain relative position.It needs motor to turn to the position that first Z signal occurs, and could obtain the current absolute position of motor by the compensation difference.Hall-type U, the V of low resolution, W scrambler are that a kind of powering on just can obtain the code-disc of absolute location information, and cheap, resolution is low, and a pair of magnetic pole can only obtain 6 absolute location information.So servo-drive system is used increment type and Hall-type scrambler usually, come dragging motor with U, V, W scrambler earlier, up to first Z signal of acquisition, and then switch to high-precision A, B, Z encoder modes.
Concerning the grating dish of incremental optical-electricity encoder, it possesses very big space and comes etching U, V, W signal grating.Simultaneously, on technology, also be very easy to realize, so be easy to just obtain the composite encoder of A, B, Z and U, V, two kinds of signals of W.But concerning combined-type magnetic encoder, because the restriction of magnetize technology and size aspect is provided with two independent parts respectively and obtains two kinds of signals.Because the magnet ring of two independent sectors is not on same plane, the axial dimension of magnetic coder will increase, and be unfavorable for miniaturization.What perhaps have is placed on Hall-type U, V, W scrambler inside the motor body, obtains U, V, W signal by the rotating magnetic field that detects motor internal.This situation, the assembling trouble is unfavorable for maintenance, versatility is bad.
Summary of the invention
At above-mentioned technical matters, the purpose of this invention is to provide a kind of high speed, small-sized, high-resolution multipole combined-type magnetic encoder.
The technical scheme that realizes the object of the invention is as follows:
Multipole combined-type magnetic encoder comprises housing, also comprises being arranged at the multipole combined magnetic grid that is used in the housing with the synchronous rotation of motor shaft, produces three different magnetic fields on this multipole combined magnetic grid respectively;
And be arranged at signal processor in the housing, after this signal processor detects the field signal that produces on the multipole combined magnetic grid, be converted to absolute type U, V, the output of W electric signal of high-resolution increment type A, B, Z electric signal and low resolution.
Adopted such scheme, the present invention adopts the multipole combined magnetic grid that can be assembled into one with motor output shaft, and it can use in rugged environment, and can produce multiple different magnetic field, and is required to reach detection.Finish by signal processor the sine and cosine simulating signal of its collection is segmented, and with the digital quantity signal of the multiplier output orthogonal of segmentation number and magnetic pole logarithm.The function that possesses detection magnetic field simultaneously owing to this signal processor, convenient multipole combined magnetic grid and the installation of signal processor and the detection of magnetic field power.Signal processor is the SOC (system on a chip) of an intelligent integrated form, possesses fixing segmentation multiple, can in rugged surroundings, use, insensitive to outside disturbing magnetic field, have the magnetic field intensity sensing capability and lose magnetic field warning function or the like.
Scrambler of the present invention and motor are the integral type mounting structure, possess characteristics such as thin thickness, parts are few, installation is simple and reliable.Because what adopt is the magnetoelectricity transfer principle, relatively the photoelectric encoder of photovoltaic principals possesses higher reliability, cost is low, antijamming capability is strong, it is affected by environment to be difficult for, and the while, it was simple and compact for structure, can run up, volume is convenient to miniaturization, the resolution height, configuration is simple, and cost is lower.
In sum, scrambler of the present invention is the magnetic field that produces three varying strengths by the multipole combined magnetic grid that adopts low resolution, with the use signal processor electronic fine-grained mode is carried out in each magnetic field of detecting, reach the radial dimension purpose of both dwindling scrambler, guarantee high resolving power simultaneously again.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is the assembly structure figure of scrambler of the present invention;
Fig. 2 is the structural representation of shell among Fig. 1;
Fig. 3 is the decomposing schematic representation of multipole combined magnetic grid among Fig. 1;
Fig. 4 is the structural representation of signal processor among Fig. 1;
Fig. 5 is the circuit block diagram of second processor;
Fig. 6 is A, B, Z signal subdivision figure;
Fig. 7 is that U, V, W signal are schemed;
Fig. 8 is the strong and weak figure of detection in magnetic field;
In the accompanying drawing, 1 is end cap, and 2 is shell, 3 is multipole combined magnetic grid, and 4 is signal processor, and 5 is magnet, 6 is magnet, and 7 is magnet, and 8 is ring groove, 9 is the hole, and 10 is intelligent integrated hall sensors, and 11 is switch Hall, 12,13,14 are locking switch type Hall, and 15 is step, and 16 is projection, 17 is the cylinder projection, and 18 is mounting hole, and 19 is the extension line seam, 20 is half recess, and 21 is recess, and 100 for detecting amplification module, 101 is signal processing module, 102 is the digital signal modular converter, and 103 is the automatic gain control module, and 104 is analog output module, 105 is the increment type interface module, and 106 is the logical AND gate device.
With reference to Fig. 1, multipole combined-type magnetic encoder of the present invention comprises housing, and is arranged at the multipole combined magnetic grid 3 that is used in the housing with the synchronous rotation of motor shaft, produces three different magnetic fields on this multipole combined magnetic grid respectively.And be arranged at signal processor 4 in the housing, after this signal processor detects the field signal that produces on the multipole combined magnetic grid, be converted to absolute type U, V, the output of W electric signal of high-resolution increment type A, B, Z electric signal and low resolution.
See figures.1.and.2, wherein Fig. 2 has reflected the structure of housing, and housing is used to protect multipole combined magnetic grid 3 and the signal processor 4 that is installed in its inside.This housing is made up of end cap 1 and shell 2.According to the size of signal processor, the size of design end cap 1 and shell 2.Shell 2 roughly is the shape of a cylinder, and shell 2 whole employing ABS plastic manufacturings form.Use screw it to be fixed on the end cap of motor shaft, and guarantee that the central shaft of shell is concentric with motor shaft by mounting hole 18 in this outer casing bottom setting.Be provided with the through hole that the power supply arbor passes at the center of shell 2 bottoms.On the internal face of shell 2, be provided with a step 15 and 3 semicolumn projections 16 that differ 120 ° mutually, signal place measuring device 4 positioned by step 15 and projection 16.Extension line seam 19 is set on the 2mm that is higher than step 15, is used for the cable that connects on the signal place measuring device 4 drawn with controller outside and is connected.Cylinder projection 17 fixed outer ends lid 1 on using 4 with the end cap joint.End cap 1 is also cylindrical, and the periphery of end cap 1 is provided with 4 recesses 21, and these recesses are that the first half is big, the latter half is little, be used for shell 2 on last cylinder projection 17 cooperate, recess 21 and projection 17 in conjunction with after, can be extremely on shell 2 end cap 1 button.Also have other 3 half recesses 20 that differ 120 ° mutually on the end cap, be used to cooperate 2 times cylinder projections of shell.
Parts of the present invention are fixed on shell 2 on the motor earlier aspect assembling, and multipole combined magnetic grid 3 is enclosed within above the armature spindle of motor, and signal processor 4 is installed in housings.By observing the output V of intelligent integrated hall sensors 10 AoSize (with reference to the strong and weak detection curve figure in the magnetic field of Fig. 8) is adjusted the distance of multipole combined magnetic grid 3 and signal processor 4, covers end cap 1 and just can obtain whole encoder.By introducing the 5V power supply, can make the scrambler operate as normal from driver.
With reference to Fig. 1 and Fig. 3, as can be seen, the output terminal of motor passes the through hole of shell 2 bottoms in Fig. 1, and multipole combined magnetic grid 3 is circumferentially fixedlyed connected with motor output shaft, and like this, multipole combined magnetic grid 3 can rotate with motor synchronous.In Fig. 3, multipole combined magnetic grid 3 comprises magnet steel, first magnetic track, second magnetic track.Magnet steel adopts softly to be moulded the compacting of magnetic ferrites material and forms, and magnet steel is provided with the center pit that is used to connect motor, and the axial end of magnet steel is provided with ring groove 8, and this ring groove 8 is used to assemble first magnetic track.Behind assembling first magnetic track and second magnetic track on the magnet steel, form multipole combined magnetic grid 3.On multipole combined magnetic grid, there are three magnetic fields, the forming of this three magnetic fields:
First magnetic track is that magnet 5, the first magnetic tracks 5 that are used to produce U, V, W field signal are annular shape, first magnetic track 5 is mounted in the ring groove 8 of magnet steel after, it is fixing to bond with glue.The number of pole-pairs of magnet is with identical by the number of pole-pairs of the rotor of measured motor in first magnetic track.The magnetic field of first magnetic track is formed by these magnets 5, and first magnetic track forms first magnetic field.Second magnetic track comprises that the list that produces the Z field signal is mounted to utmost point magnet 6 in the hole 9 that is provided with on the magnet steel axial end, and fixing with the glue bonding, magnet 6 is used to produce second magnetic field.Second magnetic track also comprises some to producing the magnet 7 of A, B field signal, and magnet 7 forms the 3rd magnetic field.In some magnets 7 to generation A, B field signal, the pole span of magnet is 1.2mm.Magnet 7 need be determined required magnetic pole logarithm according to using index.
According to above-mentioned, wherein first magnetic track and second magnetic track all are arranged on the axial end of magnet steel, and increase successively with the centre distance of magnet steel, and the axial end of first magnetic track and second magnetic track at grade.Each magnet on first magnetic track and second magnetic track all adopts the axial charging mode to obtain needed magnetic field, and promptly the axial direction along motor shaft fills magnetic field, and such magnet magnetic field intensity in the axial direction is big.
Referring to Fig. 4 and Fig. 5, signal processor is the field signal that is used to receive each magnetic track on the multipole combined magnetic grid, and these field signals are carried out electronic fine-grained, obtaining needed high-resolution increment type A, B, Z electric signal, and absolute type U, the V of low resolution, W electric signal.Signal processor comprises the PCB circuit board, and is arranged at the first processor and second processor on this PCB circuit board.
First processor comprise 3 12,13,14,3 locking switch type Halls of locking switch type Hall that are respectively applied for the absolute type U, the V that detect field signal and produce low resolution, W electric signal with the radians of 120 degree uniformly at intervals on the same circumference of PCB circuit board.Multipole combined magnetic grid 3 is in the motor output shaft rotation process, by being arranged to differ is that the 120 locking switch type Halls 12,13,14 of spending mechanical angles can detect first magnetic track 5, with absolute type U, the V, the W electric signal output waveform that obtain low resolution, its waveform as shown in Figure 7.This three-phase waveform is 120 ° of mutual lag or leads, every mutually at level of place's upset at zero point of the every utmost point in magnetic field.
Second processor comprises the intelligent integrated hall sensors that is used to detect field signal and produces A, B, I electric signal, wherein A, B electric signal are the electric signal of high-resolution increment type, and I signal is used for the reference signal of high-resolution increment type A, B after treatment.Owing to have a plurality of magnets 7 on the multipole combined magnetic grid of scrambler, multipole combined magnetic grid when rotated, every pair of magnet (pair of magnets is made up of a N utmost point and a S utmost point) is corresponding exports 1 I electric signal.When multipole combined magnetic grid rotates a circle, intelligence integrated hall sensors 10 can be exported a plurality of I signals, this I electric signal can be used for the reference signal of high-resolution increment type A, B after treatment, but this reference signal can not be directly as the reference signal of scrambler.
Referring to Fig. 5, intelligence integrated hall sensors 10 comprises: detect amplification module 100, and the signal processing module 101 that is connected with the detection amplification module, and the digital signal that is connected with signal processing module 101 conversion and Subdividing Processing module 102, and the automatic gain control module 103 that is connected with signal processing module 101, and the analog output module 104 that is connected with this automatic gain control module.And the increment type interface module 105 that is connected with Subdividing Processing module 102 with digital signal conversion.
After detecting the space sinusoidal magnetic field of amplification module 100 detection magnetic tracks, through sine and the cosine signal of preposition amplification with acquisition two-way quadrature.Detect amplification module 100 and form,, Hall sensor array in the intelligent integrated hall sensors 10 is placed on the detection radius place according to the size of intelligent integrated hall sensors 10 detection radius by Hall element and pre-amplifier.Detect the A that second magnetic track produced, the space sinusoidal magnetic field in B magnetic field by Hall element, after this A, B magnetic field detection arrived, amplify through pre-amplifier, can obtain the sine and the cosine signal of two-way quadrature, can make the amplitude of detection signal obtain increasing like this, be convenient to the back this signal is carried out analog to digital conversion.Signal processing module 101 is used to be provided with the gain multiple of sinusoidal and cosine signal, and sine and cosine two paths of signals are carried out step amplification.Signal processing module 101 is made up of signal processor and channel amplifier two parts, because the sine of gathering through the Hall element of front and the amplitude of cosine signal two paths of signals can be not identical, when the pre-amplifier amplification of this two paths of signals through the front outputed to signal processor, signal processor can be provided with the gain multiple of sinusoidal and cosine signal, and the adjustment signal of the multiple that will gain outputs to automatic gain control module 103.Because automatic gain control module 103 is used to adjust the enlargement factor that detects amplification module, therefore, the pre-amplifier in the automatic gain control module 103 control detection amplification modules 100 is amplified to identical amplitude with sinusoidal with cosine signal.Signal processor is learnt sinusoidal identical with the amplitude of cosine signal, then sine and cosine signal is outputed to channel amplifier, by channel amplifier this two paths of signals is done further to amplify.For digital signal conversion and Subdividing Processing module 102, wherein the digital signal modular converter comprises signal sampler ADC, and this digital signal modular converter is digital signal output with the analog signal processing of signal processing module 101 outputs.And Subdividing Processing module (DSP) be used to calculate current just, the positional information that comprises of cosine two paths of signals, the digital data transmission that is about to the output of digital signal modular converter is carried out location compute to processor DSP, can obtain high-resolution A, the B electric signal of two-way quadrature, with the I electric signal of answering with every pair of pole pair, these three signals are through the output of increment type interface, and the signal output waveform of these three signals as shown in Figure 6.Increment type interface module 105 is used for the digital signal conversion magnetic field position information translation that 102 segmentations obtain with the Subdividing Processing module is become the signal of increment type.
Intelligence integrated hall sensors 10 also comprises the analog output module 104 that is connected with this automatic gain control module, because intelligent integrated hall sensors 10 possesses the function that detects magnetic field, can determine the power in magnetic field according to the signal of analog output module 104 outputs, therefore, when multipole combined magnetic grid 3 of assembling and signal processor 4, be used for the spacing between definite multipole combined magnetic grid 3 and the signal processor 4, like this, be convenient to the spacing of multipole combined magnetic grid 3 and signal processor is adjusted to the optimum position.
With reference to Fig. 5, be used to the Hall device that detects field signal and produce the Z electric signal, this Hall device is electrically connected with intelligent integrated hall sensors 10.Hall device comprises switch Hall 11 and the logical AND gate device 106 that is connected with this switch Hall output terminal, and logical AND gate device 106 also is connected with the I signal output terminal of intelligent integrated hall sensors.Owing to have a plurality of magnets 7 on the multipole combined magnetic grid of scrambler, multipole combined magnetic grid when rotated, 1 I magnetic signal of every pair of corresponding output of magnet.When multipole combined magnetic grid rotated a circle, intelligent integrated hall sensors 10 can a plurality of I electric signal of output, and this I electric signal can be used for the reference signal of high-resolution increment type A, B after treatment, but can not be directly as the reference signal of scrambler.Though switch Hall 11 revolutions are only exported a digital signal, A, B electric signal that the width of this signal obtains after segmenting more than the Subdividing Processing module are wide, so do not meet the requirement of standard increment formula signal.Like this, after carrying out logical and by digital signal that switch Hall 11 is obtained and I signal, can obtain the zero-bit reference signal Z of required standard, this canonical reference signal Z is used to eliminate the accumulation error of using A, B signal to calculate, as with reference to signal and precisely effect such as location.
The number of pole-pairs of supposing magnet 7 is that the A of P, magnetic coder, the resolution of B signal are the maximal rate n of N, motor MAX, signal processor 4 detection radius be R.The segmentation number of known signal processor is 40, and field pole is apart from being 1.2mm, and the frequency response of segmentation is 5kHz.Then by following calculating:
n MAX＝(5000*60)/P?RPM (3)
After having designed the size of magnet, adopt the axial charging method, according to the design load of P, at the disposable P that fills with in the interior outside of detection radius R to magnetic pole.After first magnetic track 5 and second magnetic track magnetize respectively as requested, use glue that these two parts are embedded on the magnet steel, thereby obtain multipole combined multipole combined magnetic grid 3.
Embodiment one, to suppose to be applied to rated speed be 9000rpm, and the resolution of magnetic coder is 1000ppr: then can calculate P=25, n according to formula (1)-(3) MAX=12000RPM, R=9.55mm.From above data as can be seen: the detection radius of signal processor is 9.55mm, and then the radius of signal processor 4 is slightly bigger than 9.55mm, adds the size of shell, and the radial dimension of scrambler can not surpass 15mm.
Embodiment two, be used in the general servomotor of 750W, refer generally to be designated as: the resolution of maximal rate 5000rpm, requirement is 2000ppr.Obtain according to formula (1)-(3): P=50, n MAX=6000RMP, R=19.1mm.From above data as can be seen: the detection radius of signal processor is 19.1mm, and then the radius of signal processor is slightly bigger than 19.1mm, adds the size of shell, and the radial dimension of scrambler can not surpass 25mm.
According to above parameter as seen, magnetic coder of the present invention has the advantage that size is little, response is fast, resolution is high.
1. multipole combined-type magnetic encoder, comprise housing, it is characterized in that: also comprise being arranged at the multipole combined magnetic grid that is used in the housing with the synchronous rotation of motor shaft, produce three different magnetic fields on this multipole combined magnetic grid respectively, described multipole combined magnetic grid comprises magnet steel, first magnetic track, second magnetic track, first magnetic track and second magnetic track all are arranged on the axial end of magnet steel, and increase successively with the centre distance of magnet steel, and the axial end of first magnetic track and second magnetic track at grade; Described first magnetic track is the magnet that is used to produce U, V, W field signal, the number of pole-pairs of magnet is with identical by the number of pole-pairs of the rotor of measured motor in this first magnetic track, described second magnetic track comprises the list that produces the Z field signal to utmost point magnet, and comprises some to producing the magnet of A, B field signal;
And be arranged at signal processor in the housing, after this signal processor detects the field signal that produces on the multipole combined magnetic grid, be converted to absolute type U, V, the output of W electric signal of high-resolution increment type A, B, Z electric signal and low resolution, described signal processor comprises the PCB circuit board, and is arranged at the first processor and second processor on this PCB circuit board; Wherein, first processor comprises that 3 are respectively applied for the detection field signal and produce absolute type U, the V of low resolution, the locking switch type Hall of W electric signal, second processor comprises the intelligent integrated hall sensors that is used to detect field signal and produces A, B, I electric signal, and being used to the Hall device that detects field signal and produce the Z electric signal, this Hall device is electrically connected with intelligent integrated hall sensors.
2. multipole combined-type magnetic encoder according to claim 1 is characterized in that: some magnets to generation A, B field signal of described second magnetic track, the field pole distance of this magnet is 1.2mm.
3. multipole combined-type magnetic encoder according to claim 1 is characterized in that: 3 locking switch type Halls with the radians of 120 degree uniformly at intervals on the same circumference of PCB circuit board.
4. multipole combined-type magnetic encoder according to claim 1, it is characterized in that: described intelligent integrated hall sensors comprises: detect amplification module, after this detection amplification module detects the space sinusoidal magnetic field of second magnetic track, through sine and the cosine signal of preposition amplification with acquisition two-way quadrature;
And the signal processing module that is connected with the detection amplification module, this signal processing module is used to be provided with the gain multiple of sinusoidal and cosine signal, and sine and cosine two paths of signals are further amplified;
And the automatic gain control module that is connected with signal processing module, this automatic gain control module is used to adjust the enlargement factor that detects amplification module;
And the digital signal that is connected with signal processing module conversion and Subdividing Processing module, the digital signal modular converter is digital signal output with the analog signal processing of signal processing module output, the Subdividing Processing module be used to calculate current just, the positional information that comprises of cosine two paths of signals;
And the increment type interface module that is connected with the Subdividing Processing module with digital signal conversion, the magnetic field position information translation that this increment type interface module obtains segmentation becomes the signal of increment type.
5. multipole combined-type magnetic encoder according to claim 4 is characterized in that: described intelligent integrated hall sensors also comprises the analog output module that is connected with this automatic gain control module.
6. multipole combined-type magnetic encoder according to claim 1, it is characterized in that: described Hall device comprises switch Hall and the logical AND gate device that is connected with this switch Hall output terminal, and the logical AND gate device also is connected with the I signal output terminal of intelligent integrated hall sensors.
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|US4851771A (en) *||1987-02-24||1989-07-25||Kabushiki Kaisha Yaskawa Denki Seisakusho||Magnetic encoder for detection of incremental and absolute value displacement|
|JPH0394118A (en) *||1989-09-06||1991-04-18||Nec Corp||Encoder|
|JPH0626884A (en) *||1992-07-07||1994-02-04||San Tesuto Kk||Position detection device|
|JP3326849B2 (en) *||1993-03-03||2002-09-24||松下電器産業株式会社||Multi-turn absolute encoder|
|JPH10293042A (en) *||1997-04-16||1998-11-04||Yaskawa Electric Corp||Magnetic encoder device|
|FR2851651B1 (en) *||2003-02-25||2005-06-17||Skf Ab||DEVICE FOR ENCODING ROTATION PARAMETERS, DETECTION SYSTEM, ROLLING BEARING, AND ELECTRIC MOTOR.|
|JP2007132862A (en) *||2005-11-11||2007-05-31||Koyo Electronics Ind Co Ltd||Magnetic encoder|
- 2010-05-28 CN CN2010101858007A patent/CN101846531B/en not_active IP Right Cessation
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|C10||Entry into substantive examination|
|SE01||Entry into force of request for substantive examination|
|C14||Grant of patent or utility model|
|C17||Cessation of patent right|
|CF01||Termination of patent right due to non-payment of annual fee||
Granted publication date: 20110824
Termination date: 20130528